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Modes for selecting pictures were unclear
User 4 assumed you can only select one photo at a time- multiple selection mode was not visible or clear enough. User 6 tried to click multiple pictures in the mosaic view but clicking the first one would just brings up that individual picture.
Learnability with associating tags with pictures
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Users had various problems with understanding what buttons, labels, etc meant- something that could be made much clearer with just a few words of descriptive text. The selection mode in the mosaic, actions required for tagging, and the mark for review button all created some confusion. Some text would create an information scent that would lead users much better to the right actions for what they want to fo.